Calculating machine



y 1950 E. P. DRAKE CALCULATING MACHINE 8 Sheets-Sheet 1 Original Filed Nov. 6, 1946 INVENTOR.

ED WARD R D/PAKE By %/%%+j ATTORNEY July 18, 1950 E. P. DRAKE CALCULATING MACHINE 8 Sheets-Sheet 2 Original Filed Nov. 6, 1946 INVENTOR.

ED WARD PDPAKE BY ZMM A77'0fP/VE) July 18, 1950 E. P. DRAKE CALCULATING MACHINE 8 Sheets-Sheet 3 Original Filed Nov. 6, 1946 INVENTOR.

EDWARD P DRAKE BY ATTURIVE Y July 18, 1950 E. P. DRAKE CALCULATING MACHINE 8 Sheets-$heet 4 Original Filed Nov. 6, 1946 INVENTOR.

EDMPD P DRAKE BY ATTfiPA/E Y July 18, 1950 E. P. DRAKE CALCULATING MACHINE 8 Sheets-Sheet 5 Original Filed Nov. 6, 1946 INVENTOR m ATTMNE) July 18, 1950 E. P. DRAKE CALCULATING MACHINE 8 Sheets-Sheet 6 Original Filed Nov. 6, 1946 INVENTOR.

EDWARD I? 0mm; fl

J ly 18, 1950 E. P. DRAKE 2,515,442

CALCULATING MACHINE I Original Filed Nov. 6, 1946 8 Sheets-Sheet T INVENTOR.

EDWARD I? DEA/FE July 18, 1950 E. P. DRAKE 2,515,442

CALCULATING MACHINE Original Filed Nov. 6, 1946 8 Sheets-Sheet 8 IN V EN TOR.

EDWARD I? DRAKE BY %M%54 Arrow Er Patented July 18, 1950 I CALCULATING MACHINE Edward P. Drake, Glendale, Calif., assignor to Clary Multiplier Corporation,

San Gabriel,

Calif, a corporation of California Original application November 6, 1946, Serial No. 710,880. Divided and this application August 5, 1949, Serial No. 108,843

14 Claims. 1

This invention relates to transmission mechanism and has particular reference to mechanism for selectively transmitting motion between two geared elements, such as rack gears or a rack gear and a rotatable gear.

The invention has particular application to calculating machines of the reciprocating type which comprise reciprocating elements including rack gears, or rack gear sections, for transmitting motion from one operating or computing unit to another.

One object of the present invention is to selectively effect a driving connection between two rack gears, one movable at an angle relative to the other.

Another object of the invention is to selectively return one of the aforementioned rack gears to an initial position independent of the other.

Another object is to selectively effect a driving connection between a rack gear and a rotatable gear.

Another object is to provide a transmission mechanism for selectively effecting a driving connection between two gear elements in which the driving connection is effected by motion of a gear meshing with one gear element and rolling into mesh with the second element.

A still further object is to facilitate entry of a factor into a calculating unit of a calculating machine of the reciprocating or rack driven type.

The manner in which the above and other objects of the invention are accomplished will be readily understood on reference to the following specification when read in conjunction with the accompanying drawings, wherein:

Fig. 1 is a longitudinal sectional view through a machine embodying a preferred form of the present invention.

Fig. 2 is a side elevational view showing the mechanism for driving the main racks and for controlling the multiplier digit selecting mech anism.

Fig. 3 is a side elevation illustrating part of the controls for the main and multiplier clutches, and the motor drive therefor.

Fig. 4 is a side elevation illustrating further controls for the main and multiplier clutches.

Fig. 5 is a side elevation illustrating part of the machine controls including the add and multiplication control bars.

Fig. 6 is a front view of the multiplier digit selection control plate.

Fig. '7 is a side elevation showing the multiplicand entry bar and and linkage controlled there- Fig. 8 is a side elevation showing the multiplier entry bar, the clear multiplicand bar and the constant multiplicand bar, and linkage controlled thereby.

Fig. 9 is a side elevation showing devices for controlling the mechanism for entering and clearing multiplicand factors in and from the machine.

Fig. 10 is a detailed side elevation of the cam drive for operating the multiplicand and factor entry controls.

Fig. 11 is a transverse sectional view taken along the line ll-H of Fig. 9.

Fig. 12 is a front View, partly in section and partly broken away, showing the mechanism for coupling the main racks to the multiplicand racks for entering multiplier factors into the latter.

Fig. 13 is a sectional plan view of the multiplicand factor entering controls.

Figs. 14 to 17, inclusive, are detailed side elevational views taken along the lines |4--l4 to ll-l 1, respectively, in Fig. 13.

This application is a division of the copending R. E. Boyden and E. P. Drake application, Serial No. 710,880, filed Nov. 6, 1946. Reference is therefore made to said application for a complete disclosure of a calculating machine in which the present invention is embodied. It should be understood, however, that the invention may be equally well embodied in other forms of calculating machines.

Since the machine, in which the present invention is embodied in its preferred form, is disclosed in detail in the aforementioned application, only a brief description of the operation of the same will be made herein, and for the sake of brevity, only that mechanism which embodies the present invention or cooperates therewith will be described in detail.

Keyboard and racks The present machine is of the reciprocating rack type comprising a plurality of ordinally spaced differentially operable racks, one of which is shown at 35 (Fig. 1). Each rack is supported for fore and aft movement at the rear by a crossshaft embraced by an open slot 96 formed in the rack. At its forward end, each rack is supported by a rack drive shaft 91 suitably guided for fore and aft movement in slots, one of which is shown at I42 (Fig. 2) formed in machine side frames I43. The shaft 91 extends through and is movable alongslots 98 formed in the various racks.

For the purpose of differentially controlling the extent of movement of the racks during entry of its respective rack in the position illustrated.

The various shoulders HM are spaced from their respective keystems 4m by increments "corresponding in number to the values ofthedifferent keys. I w

The racks are utilized to transfer mechanical, representations of values between diiferent operating units of the machineysuch as'theaforementioned keyboard, an accumulator, generally indicated at 36, multiplying mechanism, generalf" 1y indicated in part at 5, etc.

Drizz e Power for the various mechanisms of the machine is obtained through a cyclically operable main clutch I (Fig. 3) and a cyclically operable multiplier clutch 9, the clutches being controlled by various ones of depressible control bars to be described later and by each other. The clutches are driven by a motor 42ilhaving a worm 42 l; on th'e'motor sh'aft'thereof which -meshes -with a worm gear 422 rotatably mounted-on a pivot".

shaft 423 and suitably fixed-to a spur gear 424. The latter meshes with a 'main clutch driving gear 4-25,-rotatably' mounted on a main shaft 8,

and a multiplier driving clutch 423' rotatably of complementary rack drive cams I33 and I3l are keyed to the aforementioned'shaft 8 and are engaged by rollersl32 and I33 of a cam follower I34; The latter is pivoted at I I6 and is connected by' a link "I35 to an arm I36 fixed on a rookable shaft 131." Also securedto the shaft l3l' are spaced, arms l38-connected by links' Mlljto'the aforementioned rack'driveshaft 91.

The slot '9 8,' in each ofthe-driVe ra'cks 3 5, terminates at its rear in laterally opposed notches I45. Thelatter are normally engag'edby rollers I46 carried on carriers I41 pivoted'on the shaft 91., "The two carriers I41 associated with any one rack are spring urgedin opposite directions. by a tension spring I48 extending 'therebetween to yieldably maintain the rollers 146 in engagement with the riotc'hesldll to form a yildable connection'bet'ween the shaft 9! and each of the"different racks 35. Thus, the carriers" I41 and their rollers lwill; couple the racks to the rack drive shaft 9! until arrested by depressed keys whereupon the rollers will move. out of the respective notches and along the edges of the slot 98.- The foregoing yieldable rack drive mechanism, isdisclosed and claimed in the copending application. of R. E. Boyden, S. N. 718,706, filed December 27,1946.

Addition controls cycle. Means (not shown) are also provided whereby depression of the add bar will cause the accumulator 36 to mesh with a rack gear section I62 on the rack 35. Referring to Fig. 5, the add bar I5 is provided with a vertical slot guided over a framepin 453. The lower end of the stem is pivotally connected to a bellcrank 454, pivoted at 455, and urged counter-clockwise by a spring 456 to normally hold the add bar in its illustrated raised position. A pin 46! on the lowerarm of the bellcrank 454' extends within a notch in the clutch control bar 46! i. The bar 46lt'is" supported for endwise movement by swinging arm'sIl4B3l and 46 the latter being fastened to a rockable shaft 465I to which is also. attached a similar arm 463! connected to the forw ardlendof a clutch control bar 46'.

Referring to Fig. 3, the link 46 is provided with a notch 468i normally embracing an ear 4'!!! on a main clutch control lever 433. The

latteris pivoted. at 4? and is urged. clockwise into engagementtwiththe full cycle shoulder'432 on the.:main clutch. Lby a spring 412 to normally hold the" clutch in disengaged condition; However, upon depression of the'addbar and consequent. forward movement of the bars 461! and 4611, the clutch control lever 433 will be rocked counter-clockwise to. cause. engagement of the mainclutch' I.

It will be noted that there are twoarresting shoulders 432 and 432a on the clutch i, diametrically op'pose'd. to each other and each capable ofbeing engaged by the lever.433 to arrest operation of the clutch 1/ However, the shoulder 4132a is ineffective to be arrested during addition operations, whereby toinsure 360 of rotation 01 theshaftduringsuch operations. For this purpose, a camming lever-432 (Fig. 4) is also pivoted at: 4-? l; independently of-the clutch. member 433, and is normally held in its? illustrated position by a spring 493. A slot 494 is formed in the lever 45l2 to guide a pin 495 carried'on a link 496 into either I of ".two positions therealong. The latter is pivotallyl-supported at its .forwardend by a bell'crank lilllEig. 5). pivoted at 498. The

latter bellcrankis connectedtoa'second factor control bar [4. andis normally held. in a counterclockwise illustratedposition. by spring 499 to maintain the pinf495 inlits rearmost illustrated positionzalong the. slot 4:14;.and to. maintain the bar i4inits illustrated vraised position; During addition; the position of the link. 436 is unaltered, thereby. holdingmthe. pin. 49.5 .over. a tail 433a. oi the: clutch control lever .433.v

Toward the mid-cycle or 'endof the first phase of the main. clutch, a'..camming member 4 9i, keyed" on the main shaft 3,; carries an ear 5M thereof against the camming edge v5Ii2-..of.the leve'r 492, thereby rocking sthe latter counterclockwise toforce the pm 495 to likewise rock the clutchmontrorlever 433- Thus, the latter will cy'cle shou1der432 of zthe'clutch. to disengage the same.

M ultiplyinq mechanism As disclosed in detail in said Boydenet a1. application; 'multiplication ;is accomplished in the present machine by sequentially multiplying all digits of the multiplicand by each digit of the multiplier. This is accomplished electrically by adjusting ordinally arranged contact elements 654 (Fig. 1) in two directions with-respect to coordinately arranged terminal contacts 655. The latter contacts are arranged in circuit (in a manner not shown) with different ones of a series of terminal strips 656 in accordance with the values of the partial products of the multiplication tables. The terminal strips 656 control differential actuating mechanism (not shown) which is operatively associated with a suitable accumulator arranged to receive and register the products of multiplication by different multiplier digits. r

The multiplicand is entered into the machine by setting the same into the keyboard and depressing a multiplicand bar 13 (Figs. 5 and 7). The latter causes operation of the machine to vertically position the different contact elements 654 by amounts corresponding to the values of the different digits of the multiplicand factor. Thereafter, the multiplier is entered into the keyboard and a multiplier control bar l4 (Figs. 5 and 8) is depressed. The latter causes operation of the machine to advance the contact elements 654 fore or aft into alignment with a vertical row of terminal contacts 655'corresponding to a first selected digit of said multiplier factor. After multiplication in accordance with the first multiplier digit, all contact elements 654 are shifted fore or aft according to the value of the next succeeding multiplier digit, and so forth, until multiplication by all multiplier digits is completed. I

M ultipliczmd entering means Depression of the multi'plicand'bar 13 against the action of its spring 661,.rock's a bellcrank 668 about its pivot 610, to carry a'pin' 61! in the lower end thereof against the forward end of an aligned notch in the aforementioned clutch control bar 46! I so as to actuate, the latter and cause engagement with the main clutch 1 (Fig. 3) 'in the same manner as described in connection with the add bar [5. I

In addition to causing engagement'of the main clutch and operation of the machine, depression of the bar [3 effects the aforementioned-vertical positioning of the contact elements 654 under control of the mainraoks 35. "The bellcrank 668 is provided with-atail 668a'effective to actuate a pin 612 mounted on the forward end of a link 613, the pin being guided in an arcuate slot I614 formed in a lever 614 which, for the purpose of the present illustration, may be considered as being held stationary in the position illustrated in Fig. '1. Thus, depression of'the'bar i3 forces the link613 rearward to' carry therewith a cam slide 615 (Figs. 9, 11,13 and 15) pivotally connected thereto. The latter is provided with elongated slots guided'over stationary guide pins 616 and 611. However, the cam slide is normally held in its forwardillustrated position by a spring 618 wherein'a cam-lobe I680 thereon upholds aroller 680- mounted on ahook 681. The latter is pivoted at 683 to a slide 664 (also guided for fore and aft movement by pins 616 and 611) and is-normally urged downward by a spring 685 extending between the hook and the latter slide. Thus, the lobe- I680, upon beingremoved from under the roller 680, allows the nose 688 on the hook 681 to engage a notch 666 (Figs!) and 17) in an aligned actuating slide 661 which isalso guided for longitudinal movement on the pins 616 and 611.

The slide 681 is reciprocated once during each main clutch cycle, and for this purpose, thelink is connected to a cam follower 69l (Figs. 9, 10 and 17) pivoted on a frame stud 692 and provided with rollers 693 and 694 engaging the periphery of complementary cams 695 and 696, respectively, keyed on the main shaft 8.

When, upon depression of the multiplicand entry bar l3, the cam slide 615 is moved rearward to drop the hook 681 into location with the notch 686 in slide 681, the two slides 684 and 681 will be coupled together so that, during the ensuing clutch cycle, the cams 695 and 696 will reciprocate both slides. The slide 684 is connected through a pin and slot connection 691 to a rockable cam plate 698. The latter is fastened to one end of a rockable shaft 699 connected to a similar plate (not shown) on the opposite side of the machine. The cam plates and slide 684 are normally held in their rearward illustrated position by a spring I611. Each of the cam plates (698) has a cam slot formed therein embracing a roller 10! mounted on opposite ends of the shaft 102 (see also Fig. 12). The latter is guided for vertical movement in slots 104 carried in the stationary machineside frames I43. The cam slots 100 are arranged so that, as the cam plates 698 are rocked clockwise, the cam slots will lower the shaft 102.

The shaft 102 has rotatably mounted thereon a series of ordinally arranged gears 103 (Figs. 1 and 12) in continual mesh with vertically movable racks 40. The latter have slots H00 therein slidable over fixed guide rods H01 and H02 and each of the racks is provided with a horizontally extending slot 142 embracing the associated contact element 654 whereby to carry the latter vertically when the rack 40 is likewise adjusted, as will be described presently.

Each of the main racks 35 is provided with a rack gear section in continual mesh with an associated idler 106, the latter being rotatably mounted on a stationary rod 105 and located in juxtaposition with an associated multiplicand rack 40. The diametrical pitch of the idlers 106 and teeth 40a of the racks 40 are the same, and the disposition of the gear teeth thereon is such that when these parts are in their illustrated home positions, the teeth of both the pinions 106 and the teeth 40a will be in alignment. Therefore, as the shaft 102 is moved downward to its alternate dot and dash line position 102a, the various pinions 103 thereon will roll downwardly along the teeth 40a into mesh with the idlers 106, thereby forming an operative connection between the main racks 35 and the multiplicand racks 40.

The above mentioned meshing operation occurs during the second half of a main clutch cycle, i. e., after the main racks 35 have been differentially advanced. Therefore, it is during the return-movement of the racks 35 to their illustrated home positions that the multiplicand racks 40 will be differentially adjusted downwardly from their upper illustrated home positions by amounts corresponding to the values of the different multiplicand digits.

Means are provided for locking the various multiplicand racks 40 in their home positions illustrated in Fig. 1 or in any other positions to which they may be adjusted. Referring to Figs. 1, 9 and 12, a rack lock bail 161 is pivotally supported on trunnion bearing 168 mounted in the machine side frames M3, and the. bail is normally urged clockwise toward a position out sag-5115,2442

'7 oisi'locklng, engagement with the teeth. of. the various racks 40 byacspring ans, zAroller; M11 is carried by the bail l'llltzand -norma'lly.,rests on icamlobesJJ-I: andllZ .formed on the previously described slide. 685: and. 1a. 'secondlvv-slide H 3, respectively, both -.guided-.f,or longitudinal movement by the. stationarymins i616 and .611.

llheo sliderllwzis urged. toward the tront oftthe machine by. a spring; Bald .tomai-ntain .therear edge of a guide ..s10.t therein against ea. istud 1115 carried by the aforementioned. slidewlfiflil (Fig. Thereiore, at the-startaofzthe multiplicand entry'nperation, the rearward movement 10113119 lsli'dezfildefiected bysdepressionvofpthe har ll 3;-wi-1l cause-ethic stud. 115; :to .force the. link s'lzll3grear- "ward: tomemove the cam Jlobe 11.2,: fromv below the roller H1! ;on the lockabail Jill, leaving the latter telnet-supported. solely by the slide 6.8.1.

second half .ofthermain clutch cycle-during lthemultiplicandentry operation, the-"slide filll-lrwill :be moved forward, carrying the .lobe lilalyout :Erom undertheiroller 'Hll, so that: the rhailmayhemovedlby;its;spring 789 out of lockinggengagement; .withthe, racks 4J1.

lihejlock-hail lllllpwillvremain out of engage- 1 mentjwith the racks 940 until the end'of the main "clutch-t icycle, at. which time the slide 1681 under actuation by carns 695 and 96 .(Eig. will force the locking bail 101 into lockingengage- .ment with the racks 4o ;to :hold them in their fliffierentgadjusted pos ons,

Mmltiplier entering; landarnwltiplication control mechanism.

fllhesmultiplieriis genteredzinto the. machine ;by settingt-he factor. into the. keyboard .andde- :pressingthe multiplier. bar .14 (Figs. 5xand 3). The latter will initiate ..operation of the .main clutch T! (Fig. 3) and will conditionthe same -to-rbecome-disengaged aththe end of its firstiphase aor $80, :of rotation and to initiate. operation of the; multiplier clutch-,9. to cycle a :numbenof 'vtirnes depending 'onlthelnumber. of significant ldigits ;-inj the; multiplier iiactor. .multiplication by all multiplier digits, the multieplier clutch B will become disengaged and fwill effect 'reen'gagement, 0f the main: clutch l to complete :its second sphasetor "180? .of rotation.

Referring ,to Fig. 5,; depression oivtheornultir fplicr bar, l4 wi1l.rock; bellcrank 481; aboutr its pivot tiltto draw, the aforementioned link 1 (seelalso Fig. 4-) forward to move the-pin 495 therein :into a forwardlposition wherein it- .overlies a ;bel'lcrank M 1 :(see also Fig 3) The :latter .is pivoted at 4' independently of the lever-433 and is urged clockwise into its illustratedxposition by a spring "H8; The bar 14 :is held :depressed through means (not shown) throughout the. multiplication operation and therefore "the pin #85 will be retained over the tail of, the bellcrank 1 ll untilthe very end *ofsuch; operation.

It'willbe noted on reference to ,Fi 5 -that thegpivot pin lfiflconnecting the link 49.6 tothe bellcrank 491 extends into a notch in thee-fore- .mentioned clutch controlbar 4 6M so that as --the bar 14 is depressed, the pin l:2il;will .drawqithe clutch control bar forward to cause engagement At, the; completion; of k :of the main vclutch in the same--manner-rasj deichanicallyprepresent thevalue of the multiplier .iactonset up-iny-the keyboard.

d -the end of the first lof operation clutchgthe car; 59;! (Fig. 4) of mem- 133F491 ;-will5-oam;- the lever 492 counter-clockwise causing; therein-495; which is now located over the-tail ofthe bellcrank 7H1, to likewise rock the latter,

The bellcrank; 'H-Tis connected through a link 12,] t -a multiplier clutch control lever 123, simlilar-.in-construction and function to the lever 4-33; Thus, v-the lev er I23 will-be rocked counterclockwise against the action of its spring to cause engagement of the multiplier clutch. A lever 7-261 similar toleverAQZ; is pivoted at'124 independently;.ofrlever 7.23 :andis urged clockwise by a-spring lfifi. Thisleveris providedwith an elongatedslot which-guidesa pin 12'? carried by a link 12:8- pivotally connected at its forward end :to-a ;bellcrank--129. The latter is pivoted atgl3'l and normall-y held in its illustrated position r by its; spring 132 to thereby normally hold the --pin;12lin1-the rear portion of its slot where- .insitloverlies a'tailformed in theclutch control lever-1 23 Keyed; onthe multiplier shaft to is member In -having; an ear ltdthereon 1 which is efiective .just prior,- to; the end of -a multiplier clutch cycle to 0am theslever .126 counter-clockwise. Normally, thee-pin 1211s held in its rearmost position andwthus themember 133 will cause lever [26 to iorce pin J21=to=hold the clutch control member 1.23 away-:from the periphery of the multiplier clutch as the full-cycle indentation 9a thereof moves past the tip of the clutch control lever. Consequently, the clutch will re-cycle and during each new cycle themachine will multiplythe.mmtiplicandiby a new multiplier digit.

The,above re-cyclingrof the multiplier clutch will continue until the multiplicand has been multipliedby eadhsignificant. digit in the multiplier at whichtime the bellcran'k 729 is rocked countereclockwi e, as .will be described hereinafter, to position the pinlZl at the forward end of the slot in the lever 126,. and in a position overlying. the tailoi bellcrank 735. The latter is-,.norrnally'fheld theflposition shown by its spring 1136; andiskconnected bya link 738,120 a bail pivoted at '47 I As the multiplier clutch, approaches the end "or its "final; cyclelwith thepin lZl located at its .ionward position, the cammingxmember 733 will .agairrrqdk the :lever "liifiicounter-clockwise but .sinceothetclutch control lever- T23 is now permitted to ,engagethe, full cycle indentation 9a of the clutch, the latter will become automaticallydisengagedlf On-,. the other hand, the bellcrank Il35iwill{be,rocked by-the pin 12], forcing a,;bent-lover projection 338a, on the link 738 to engage .tliesear tlil of the main vclutch control lever 1331 (seealsol Fig 3) vto reengage the latter clutch sot-as tomcomplete its-second phase or second-?; of :operation.

previouslyedescribed, multiplication is performed by successively multiplying all digits of ts i -zthe m tipl ier i. :e,, :by one multiplier 2 m. onsequ nt me s are pro- A J A or sequentially; causing successivelyhigher denomination-a1 ones;of the-(racks 35 to, control themultiplication process; Forgthispurpose, the latter means is arranged ,to control the multi- ;pli ca.tion unit' which is not. completely disclosed zherei-m Sufliceritto-say, however, that thelmultiplication unit comprises in part a plurality of.

ordinally arranged plates 144 held together as a unit by transversely extending rods 145 and I46 movable fore and aft in guide slots 141 and 148, respectively, formed in the machine side frames I43.

Means are provided for sequentially sensing the various racks 35 which have been advanced to represent multiplier digits and to maintain the multiplier clutch in engagement until multiplication by all significant digits of the multiplier has been completed. As shown in Figs. 1 and 6, a vertically shiftable control plate 154 extends across the machine and is mounted on rollers 155 on one side and 155 on the other, said rollers being guided in vertical slots 151I formed in the machine side frames I43.

The plate 154 is guided vertically in parallel movement by yoked arms 151 (Fig. 5) and 158 (Fig. 2) which arms embrace the upper ones of the rollers 155 and156, respectively. The arms are secured to a rockable shaft 160 to which is also secured an arm 16I urged clockwise by a spring 182 to yieldably force the control plate I54 downwardly.

Two separate devices are provided to normally hold the plate 154 in its raised position in all operations except multiplication. As shown in Fig. 2, a yoked arm 153 is pivoted to one arm of the cam follower I34 and embraces the roller 164 on the arm 16I. When the main clutch and its. shaft 8 are in full cycle position, the cam follower I34 causes the arm 163 to maintain the plate 154 in its raised position. During the main clutch cycle, the cam follower I34 rocks counterclockwise, moving the arm 163 to its dot-anddash line position 163a. It will be recalled that during multiplication, the main shaft 8 will be held in a half-cycle position and the cam follower !34 will therefore allow the plate 154 to be moved downward, if not otherwise restrained.

The second device for retaining the plate 154 in its upper osition comprises a latch 165 (Fig. 5) pivoted at 166 and connected to the second factor key operated bellcrank 491 by a link 110. The latch is normally effected to latch a pin 153 on the arm 151, as illustrated.

Upon depression of the multiplier bar I4, the link 11!! will rock the latch I65. causing the same to release the arm 151 so that the plate 154 will move downwardly when subsequently permitted to do why the cam follower I34.

Referring to Fig. 6, it will be noted that the plate I54 is provided with a series of ordinally arranged notches 114 arranged in echelon and in alignment with pairs of sensing and control lever 115 and 180. The path of movement of the vertical leg of each notch is located in alignment with the nose.115 of an associated sensing lever 116. The latter is pivoted at 111 and urgedcounter-clockwis'e by a spring 118. Juxtaposed selection control levers 180 are also pivoted at 1l1 and each is urged counter-clockwise by a spring 188. 1

All levers 11B and 190 are normally held outward in their positions illustrated in Fig. l by a bail 18I operated by a, suitable control mechanism (not shown). However, during multiplication operations, the bail 18I is retracted rearward, allowing the levers 11B and 130 in each order to be moved rearward by their respective springs unless otherwise prevented from doing so'as will presently appear, causing their noses 115 and 186, respectively, to either engage side of the control plate 154 or to enter an aligned one of the notches 114. It will be notedthat only one set of levers 116 and will be effective to latch the control plate at any one time.

Means are provided for preventing a pair of levers 116 and 189 from blocking downward movement of the plate 154 when the associated rack 35 is in its zero position. An ear I9I is arranged to underlie a nose 199 on the associated lever 180 when the rack is located in its zero position illustrated in Fig. 1. If a rack 35 is not advanced from its zero position, the associated selecting lever 18!] will be held outward against the action of its spring 188 and the latter, in turn, will hold the associated sensing lever 116 outward by virtue of an ear 192 thereon overlying the lever 180. The plate 154 in conjunction with pairs of levers 116 and 180 forms the means for sequentially causing the different racks 35 to control the multiplying operation. For this purpose, levers 116 and 180 are provided with pear shaped slots 193 and 194, respectively, through both of which (in each order) projects a pin mounted on the lower end of a cam link 195. The upper end of the link carries a camming pin 191 extending into and movable along a vertical guide slot 198 in an associated aforementioned plate 144. Also, the pin 191 extends into a triangular camming aperture 809 in the associated rack 35.

The pin 195 at the lower end of each link 195 extends into a substantially arcuate slot 8M formed in a juxtaposed lever 892 which is securely fastened to a rockable shaft 863, there being a lever 892 in each order of the machine. The slot MI is provided with a shoulder 894 toward which the pin 195 is urged by spring 895. The spring 895 is also effective to normally maintain the link 196 in its illustrated raised position. However, the slot 194 in the lever 189 normall prevents the pin 195 from moving to a position under the shoulder 804 unless the two associated levers 11B and 193 are allowed to rock into their blocking positions relative to the plate 154.

The shaft 893 and arms 802 are oscillated once during each multiplying cycle. Therefore, when any set of levers 116 and 189 has moved into locking relation with the plate 154, the associated pin 195 will have been positioned by its spring 895 below the shoulder 804 of the associated lever 802, and during the ensuing oscillation of the shaft 803 the link 196 will be drawn downwardly causing the pin 191 to cam along the engaging surface of the triangular aperture 899. thereby moving the carriage formed by the various aforementioned plates 144 lengthwise to a new position corresponding to that of the associated rack 35.

Toward the end of the downward stroke of a lever 892 which is driving an associated camming link 1953, the pin 195 thereon will cam along the forward edges of the slots 193 and 1%4 in the associated levers, drawing the latter levers out of blocking relation to the plate 154 so that the latter will be free to move downward until blocked by the levers of the next higher order which con tains a significant multiplier digit.

Referring to Fig. 2, the shaft 803 has an arm 8H thereon connected by a link BII to a cam follower BIZ pivoted at 8I3. The latter is provided with a roller 9 I 5 held against the periphery of a cam 826 on the multiplier shaft I Ii by a spring 8I4.

It will be seen from th foregoing that the plate 154 will progress downwardly, step by step, as the multiplication operation ensues and will progressively advance the shaft 16%! clockwise eer-5,442

11-1 accordin ly. Attachedto the :shaft 160 is'an arm I 030 which, when the: platelfit-moves to-its lowermost position, will engage-the aforementioned bellcrankllil, rocking the sameoounterclockwise to position the link "'I-28'and pin"l2 l in-a forward position which, as described hereinbefore, will effect termination of. operationyoi the multiplier clutch 9 at the end of its current cycle and will cause re-engagement of the main clutch to complete its second'phase of operation.

, Automatic, clearance ofwmultzfplz'cand The ,multiplicand racks 14'0 ""which'areset to represent the multiplicand factoridu'ring a -mu'ltiplication are normally automatically cleared or returned to their upper positions during the second phase orl80 of rotation ofv the main clutch in a multiplication operation.

Referring to Fig. 3, va .lever H2 is supported at 493 andlies adjacent the aforementioned bellcrank 491 whereby upon depressionof the multi-- plier bar I4, the bellcrank will rock the lever N112 clockwise. This leveris connected to one end of a ,link IBM having, a slot .atits opposite end guided over a pin .IOI5,mo1mted.on a lever iii-t6, which for the present purpose .may be considered as fixed in'thepositionshown. In such position of .theleverllllfi, the right end of the link IOI4 lies in front of the pin I III! on a link IOI0. The latter .is guided at its front end by a frame stud I020 and at its rear end by .a slot I02I (Fig. 9) in a lever [022, in which. slot a stud I023 on the link is mounted. The lever I022 is pivoted-at. 6 92 .and is connected by a pin and slot connection I024 to a vertically movable guide rack. I025 .(seealso Fig. 12). The latter hasslots therein guided over frame. studs I026 and I021 .and haslarackgear section thereon incontinual mesh witha gear I028 fixed onthe pinion shaft I02.

On depressionpf the multiplier bar I4,-the link IOI 8 will be actuated rearwardly by link positioning the stud I023, which normally-lies solely within the slot I 02L within the second. shorter slot I030a in. a cam follower I030. The latter is pivoted .at 502 and is urged counterclockwise. by a spring I029 to hold a roller I03! thereon against the periphery of a cam I032 keyed .on the main shaft 8.

Also, during .rearwardmovement .of the link IOI8 a pin I033 thereon engagesashoulder I034 on the slide (I3 (see also Fig. v16) more the latter rearward so. as to. retractitscam lobe H2 from under the lock bail roller'llil, thus leaving the lobe III of slide 68! to solely maintain the lock. bail ltl in detenting position.

Now, during thesecondphaseof the main clutch cycleduring a multiplication operation, the camsv 695 and 606 (Figl-O) will; actuate the follower .69I to retract. the slide .08? permit the spring I09 (Fig.9) to release thelockbe i l'Il'I from detenting position. Shortly thereafter, the cam I032 will rockthe camfollower .5 and since the latter .isnow coupled tothe lever I022 by the stud I023, thelever willraise the rack I025 to rotate the gear I.028..and. shaft I02 counterclockwise, it being recalled that the shaft is now located in its upper position illustrated in Fig. 9 and is retainedin that positionsexcept during entry of the multiplicand factor.

Referring to Fig. 12in particular, theshaft I02 is providedwith along key. Idddfittedin a longitudinally extending .keyway therein. The key has ordinally .arrangeddrive sections and intermediate sections, the latter of which have their outer surfaces extending coextensive with the periphery "of the shaft 702. The various pinions "I03 are guided longitudinally by the drive sections, and each pinion 'hasa tooth I03I thereon, on one side thereof, which, Whenthe associated rack 40 is in 'an upperhome position, as shown'in Fig. 1, rests in contact with an adjacent drive portion of the key I036.

During entry of the multiplicand, the pinions will have'been rotated by the main racks 35, relative to the shaft 102, causing the teeth "I031 to recede from the key I036 so that, during the major portion of the multiplication, thekey I0'3Swil1 be located at different angular positions relative to the pinions, depending upon the value of the different digits of the multiplicand.

Now, during the latter half of the second phase of the main clutch'cycle (near the completion of a multiplication operation) ,the shaft I02 will be rotated counter-clockwise, as'viewed in Fig. 9, by

the rack I 025, causing the key I036 to pick up the various pinions I03 by their respective teeth I031 to return the pinions and their respective racks .0 and contact elements 054 to their home positions.

Upon return of thecam follower'69l (Figs. 10 and 17) to home position, the latter will draw the slide 681 rearward to cause the cam lobe III thereon to relock the bail I01 in its detenting position. Thereafter, the cam I032 will permit the spring I'029"to 1owerthe rack I025, through the elements I030 and I022, whereupon the key I036 will be rotated away from the teeth I03! of the pinions I03 so that they may subsequently be positioned to represent the digits of a new multiplicand factor.

= Constant multiplicand control means It is frequently desired to use the same multiplicand factor .for .a series of succeeding multiplicationoperations, as for example, in interest or tax computations, and inorder to obviate the necessity of having the operator set the constant multiplicand in the keyboard for each new multiplication, means are provided to render the automatic .first factor clearing mechanism described in the preceding section ineffective. This means is controlled by a constant first factor key 3| (Fig. 8). Thelatter, when depressechis adapted through means (not shown) to be held depresseduntil manually released.

Referring to.Fig. 8, the key 3I is normally retained in its raised position bya spring I038 and the stem thereof is pivotedto one end of a lever IOI6 fulcrumed at I040 and provided with the pin IOI5, whichit will be recalled, supports the right hand end of the actuating link I0'I4. Thus, depression of the key 3| will raise the link IOI4 to a position wherein it will be ineffective to force the link IOI8 rearward upon depression of the multiplier bar I4. Therefore, the multiplicand racks 40 will not be automatically returned to their home positions in the manner described in thepreceding section at the completion "of the current multiplication operation.

Manually controlled clear 'multzplzcand mechanism Means are provided toenablethe operator to clear the multiplicand from themultiplying unit, 1. e., to returnthe contact elements 654 and racks 40 toitheir homepositions, atany desired time. For this .purpose, a clear' multiplicand! bar .30 (Fig. 8) is providedwhich, whendepressed, causes a main clutch operation to return the various a 13 multiplicand racks 40 (Fig. 1) to their upper home positions.

The bar 36 is normally held in a raised inefiective position by a spring 140a, and the stern of the bar is connected by a bellcrank H142, pivoted at I040, to a link I043. The forward end of the link is connected through a pin and slot connection to the aforementioned lever Hill so that upon depression of the bar30, the lever 1M2 will be rocked clockwise, causing the clutch control bar l6l to effect engagement of the main clutch for a complete cycle of operation. Thus, also, depression of the bar 30 will actuate the clutch control bar 45! and, through the link I|4 (providing the bar 3| is in its raised position), actuate the link M8 to effect restoration of the multiplicand racks 40 to their home positions in the same manner as is effected normally at the completion of a multiplication operation.

Having thus described the invention, what I desire to secure by United States Letters Patent 1. In a transmission mechanism, the combination comprising a first toothed member, a second toothed member displaced laterally from said first toothed member and having one portion of the teeth thereof in lateral alignment with a portion of the teeth of said first member and another portion of the teeth thereof out of lateral alignment withthe teeth of said first member, a third rotatable toothed member, and means for rotatably guiding said third rotatable member along the teeth of said second member while in meshing relation therewith and into and out of mesh with the teeth of said first member.

2. In a transmission mechanism, the combination comprising a rotatable gear, a rack gear displaced laterally from said rotatable gear and having a portion of the teeth thereof in alignment with a portion of the teeth of said rotatable gear, an idler gear device having teeth in mesh with the teeth of said rack gear, and means for rolling said idler gear device along said rack gear while in meshing relation therewith to mesh and demesh the teeth thereof with said rotatable gear. a I

3. In a transmission mechanism, the combination comprising a pair of independently operable rack gears, a rotatable gear in mesh with one of said rack gears, means rotatably supporting said rotatable gear with aportion of the teeth thereof in alignment with the teeth of the other of said rack gears, an idler gear device in mesh with said other of said rack gears, and means for rolling said idler gear device along said other rack gear while in meshing relation therewith and into and out of mesh with said rotatable gear.

a. In a transmisson mechanism, the combination comprising a drive gear, a rack gear displaced laterally from said drive and having a portion of the teeth thereof in alignment with a portion of the teeth of said drive gear, an idler gear device having teeth in mesh with the teeth of said rack gear, means for rolling said idler gear device along said rack gear while in meshing relation with said rack gear to mesh the teeth of said idler gear device with. said drive gear whereby to transmit rotation between said drive gear and said rack gear, and means for rotating said idler gear device independently of said drive gear whereby to move said rack gear independently of said drive gear.

5. In a transmission mechanism, the combination comprising a drive gear, a rack gear displaced laterally from said drive gear and having a portion of the teeth thereof in alignment with a portion of the teeth of said drive gear, an idler gear having teeth in mesh with the teeth of said rack gear, a shaft rotatably supporting said idler gear, means for moving said shaft along said rack gear to roll said idler gear along said rack gear while in meshing relation therewith into mesh with the teeth of said drive gear, a lost motion connection between said shaft and said idler gear, and means for rotating said shaft whereby to cause said idler gear to move said rack gear independently of said drive gear.

6. In a transmission mechanism, the combination comprising a rack gear, a rotatable drive gear therefor, means rotatably supporting said dri e gear with a portion of the teeth thereof in alignment with the teeth of said rack gear, an idler gear, a shaft rotatably carrying said idler gear in mesh with said rack gear, means for moving said shaft along the length of said rack gear whereby to roll said idler gear along said rack gear while in meshing relation therewith and into mesh with the teeth of said drive gear, a lost motion connection between said shaft and said idler gear, a second gear fixedly carried by said shaft, a second rack gear in mesh with said second gear, and means for moving said second rack gear whereby to cause said idler gear to move said first mentioned rack gear independently of said drive gear.

'7. In a transmission mechanism, the combination comprising a drive gear, a rack gear displaced laterally from said drive gear and having a portion of the teeth thereof in alignment with a portion of the teeth of said drive gear, an idler gear having teeth in mesh with the teeth of said rack gear, a shaft rotatably supporting said idler gear, means for moving said shaft along said rack gear whereby to roll said idler gear along said rack gear while in meshing relation therewith into mesh with the teeth of said drive gear to transmit rotation from said drive gear to said rack gear, means for rotating said drive gear selected amounts whereby to advance said rack gear to selected positions, means on said idler gear forming a shoulder, means on said shaft forming a second shoulder engageable with said first mentioned shoulder, and means for rotating said shaft in a direction to return said rack gear from advanced position.

8. In a calculating machine, the combination with a computing unit including a gear member settable in different positions to enter digits of different values. respectively, into said unit; of a drive gear displaced laterally of said gear memher and having portion of the teeth. thereof in alignment with portion of the teeth of said gear member, an idler gear having teeth in mesh with the teeth of said gear member. means for.

rolling said idler gear along the teeth of said gear member while in meshing relation therewith from a position out of mesh with said drive gear to a position in mesh therewith whereby to transmit motion from said drive gear to said gear member, and means for differentially advancing said drive gear whereby to cause said gear member to enter selected digits into said unit.

9. In a calculating machine, the combination with a computing unit including a gear member settable in different positions to enter digits of different values, respectively, into said unit; of a drive gear displaced laterally of said gear member and having a portion of the teeth thereof in alignment with a portion of the teeth of said gear member, an idler gear having teeth in mesh wag with h ,teet aid sea me b mean fe rollinglsaid 'dler gear along the teeth of said lgear member", hiie in meshing relation therewith fromlalppsl lonput of mesh with said drive gear toa position in mesh therewith whereby to transmit motion from said drive gear to said gear member,-1nea11s for differentially advancing said drive gear, andpower means for operating said last-twomentioned means in sequence.

,10.,lnra calc'ulating machine, the combination with acomputing unit includin a rack gear member settable into different positions to enter digitsof different values, respectively, into said unit; of adrive geardisplaced laterally of said earmember and having a portion of said teeth thereofin alignment with a portion of the teeth Oisaidgear member, anidler gear having teeth inme'shwith the teeth of said gear member, a,

device normallylocking said gear member in any of said positions thereof, means for rolling said idlengear along said gear member while in meshing relation therewith from a position out of mesh with said drive gear to a position in mesh therewith whereby to transmit motion from said drive gear to saidjgear member, means for thereafter releasing said locking device, and means for thereafter differentially advancing said drive gear.

llQ In a calculatingmachine, the combination with a computing unit including a gear member settable intodififerent positions to enter digits of different, values, respectively, into said unit; of a, drive gear displaced laterally of said gear memberandhaving aportion of the teeth thereof in alignment with a portion of the teeth of said gearlmember, an, idler gear having teeth in mesh withthe teeth of said gear member, alocking device for locking said gear member in any of saidpqsitions thereof, a pair of retainers for retaining said locking device in looking position, power drive means for releasing one of said retainers, means for rollin said idler gear along said gear member while in meshing relation therewith from aposition out of mesh with said idler gear to a position in mesh therewith, manually. manipulatablemeans for causing operation of ,said power drive means and said last mentionedmeans, and means operable by said manuallymanipulated means for releasingt'he other of said retainers.

12. In a calculating machine, the combination with a computing unit including a rack gear settable in difierent positions to enter digits of diiierent values, respectively, into said unit; a drive gear, means for difierentially advancing said drive gear, means for selectively transmitting motion between said drive gear and said rack gear comprising an idler gear in mesh with said rack gear, a locking device for locking said rack gear in any of said positions thereof, a pair of retainers for retaining said locking ,device in looking position, power drive means for releasing one of said retainers and for rolling said idler gear along said rack gear while in meshing relation therewith from a position out of mesh with said drive gear to a position in mesh therewith, and manually manipulatable means for causing operation of said power means and for releasing the other of said retainers.

'- V l a V retai' ersadapted to, retain said, loeking' device 1. N P, aea aulat n l h l hi iih? PQQDiP ifi-QP with acmn'puting "u'n'it including a racl; gear settablejn diiierent positions to enter digits of different values, respectively, into saiduniti" of a fdri e7 anm9an$ er fii ier a ly e iq i s said'drive gear, means for selectively transmitne meiiqnb tween dr e nd sa d 1? earcs m r i s ma le eariam sh i h sai rackgear; a locking device forlocking said rack ear in ny o ai meth r ef a Pa of in l k e 'i sii'ie f ss r e d vin 9 r b .9 e e s v ea e d reta n m an for reciprocating said s1 ide', a driven slide, means operatively 'connectii ig' said driven slide with id idler ea fandiadabte i9 r911 s d an: ear along said'ra'cl; gear'fwhileiinmeshing rela tiontherewith iro'in' a position out of mesh with Said drive gear ea: 'fpq iti n n m s the ewit w e b to rans i mov n b we n sai drive gear and sa'id track gear, a depressible k ey, and means operable by said key upon depression thereof for releasing the other of said retainers slide. 7

141 In a calculating machine, the combination with a computing unit including a rack gear and for couplingsaid driven slide to said driving settable in differentlpositions toenter digits of difierent values, respectively,, into said unitj of a drive gear, means for difierentially advancing saiddrive gear, means for selectively transmitting 'motionjbetw'een said drive gear and said rack gear whereby to advance said rack gear, said last mentioned m ans comprising an idler gear; a shaft rotatably carrying said idl er gear in mesh with said'ra'ck" gear, means on said idler gear forming a shoulder, means on said shaft form mg a'second"shoulderengageable with said first mentioned shoulden'meansf for moving said shaft along "the length of said rack gear whereby' t'o roll said idler gear along said rack gear while in "mesh'ing relation therewith from a position out ofinesh with'said drive gearto a position in meshtlierewith, a depressible key, means controlled'by said key upon depression thereof for causing sequential operation of said shaft moving means and said diiierential advancing means,

a gear fixedly carried by said shaft, a second I rack gear in mesh with said last mentioned gear, a'second depressible key, and means controlled' by said second key upon depression thereof for moving said second rack gear whereby to rotate said shaft and said idler gear to return said'first mentioned rack gear.

1 "EDWARD P. DRAKE.

REFERENCES CIT-ED following references are of record in the file of patent:

- UNITED STATES PATENTS 

